FN Archimer Export Format PT J TI Needle in a haystack: involvement of the copepod Paracartia grani, in the life-cycle of the oyster pathogen Marteilia refringens BT AF AUDEMARD, Corinne LE ROUX, Frédérique BARNAUD, Antoine COLLINS, Catherine SAUTOUR, B SAURIAU, Pierre-Guy DE MONTAUDOUIN, X COUSTAU, C COMBES, C BERTHE, Franck AS 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:; FF 1:PDG-DRV-RA-LGP;2:;3:PDG-DRV-RA-SEMII;4:PDG-DRV-RA-GAP;5:;6:;7:;8:;9:;10:PDG-DRV-RA-LGP; C1 IFREMER, Lab Genet & Pathol, F-17390 La Tremblade, France. Univ Bordeaux 1, UMR 5805, Lab Oceanog Biol, CNRS 2, F-33120 Arcachon, France. Ctr Rech Ecol Marine & Aquaculture, F-17137 Houmeau, France. Univ Perpignan, CBETM, CNRS, UMR 5555 Lab Biol Anim, F-66860 Perpignan, France. C2 IFREMER, FRANCE UNIV BORDEAUX 1, FRANCE CTR RECH ECOL MARINE & AQUACULTURE, FRANCE UNIV PERPIGNAN, FRANCE SI LA TREMBLADE CAMARET LA TREMBLADE RONCE LA ROCHELLE SE PDG-DRV-RA-LGP PDG-DRV-RA-SEMII PDG-DRV-RA-GAP PDG-DRV-RA-CREMA IN WOS Ifremer jusqu'en 2018 copubli-univ-france IF 1.828 TC 66 UR https://archimer.ifremer.fr/doc/2002/publication-2778.pdf LA English DT Article DE ;Experimental transmission;In situ hybridization;PCR;Paracartia grani;Ostrea edulis;Marteilia refringens AB Marteilia refringens is a major pathogen of the European flat oyster, Ostrea edulis Linnaeus. Since its description, the lifecycle of this protozoan parasite has eluded discovery. Attempts to infect oysters experimentally have been unsuccessful and led to the hypothesis of a complex life-cycle involving several hosts. Knowledge of this life-cycle is of central importance in order to manage oyster disease. However, the exploration of M. refringens life-cycle has been previously limited by the detection tools available and the tremendous number of species to be screened in enzootic areas. In this study, these two restrictions were circumvented by the use of both molecular detection tools and a mesocosm with low biodiversity. Screening of the entire fauna of the pond for AT. refringens DNA was systematically undertaken using PCR. Here, we show that the copepod Paracartia (Acartia) grani is a host of M. refringens. Not only was DNA of M. refringens consistently detectcd in P. grani but also the presence of the parasite in the ovarian tissues was demonstrated using in situ hybridization. Finally, successful experimental transmissions provided evidence that P. grani can be infected from infected flat oysters. PY 2002 PD SEP SO Parasitology SN 0031-1820 PU Cambridge University Press VL 124 UT 000174925000009 BP 315 EP 323 DI 10.1017/S0031182001001111 ID 2778 ER EF